PRIMARY AUDITORY NEURONS OF MONKEY

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Abstract
Histological as well as electrophysiological studies on the auditory nerve of monkey revealed that the cochlear nerve bundle is almost free from nerve cells whereas the vestibular nerve has many nerve cells in it. The latency of response of each cochlear nerve fiber in response to sound stimulation was determined by measuring the time interval between the arrival of sound at the ear and the beginning of nerve fiber discharge recorded at the intracranial cochlear nerve bundle. It was found to range from 1.0 to 2.0 msec. or longer depending upon the discharge rate of the neuron. There was no discrepancy between the conclusion obtained from the el'' ctrophysiological studies on the cochlear nerve fibers and that obtained by the histological studies on the cochlear nerve.

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